Yes you can but you do have to serve as a general infantry soldier first. The timeline for this is dependent on your approach and desire to become a mortar soldier. Essentially be honest about your aspirations and attend the first mortar cadre you can and it may only take a couple of years.
Also, is it possible for a citizen of the United States to join the British army?
Unfortnately not - unless you are a dual passport holder. You must be a British Citizen, a British subject under the Nationality Act of 1981.
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